US20180023226A1 - Starting Method for a Weaving Machine - Google Patents

Starting Method for a Weaving Machine Download PDF

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Publication number
US20180023226A1
US20180023226A1 US15/546,812 US201615546812A US2018023226A1 US 20180023226 A1 US20180023226 A1 US 20180023226A1 US 201615546812 A US201615546812 A US 201615546812A US 2018023226 A1 US2018023226 A1 US 2018023226A1
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United States
Prior art keywords
machine
weaving
shedding
rotational speed
time point
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Abandoned
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US15/546,812
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English (en)
Inventor
Michael Lehmann
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Assigned to LINDAUER DORNIER GMBH reassignment LINDAUER DORNIER GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEHMANN, MICHAEL
Publication of US20180023226A1 publication Critical patent/US20180023226A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/007—Loom optimisation
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/002—Avoiding starting marks
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/005—Independent drive motors

Definitions

  • the present invention relates to a method for the controlled start-up or run-up of a weaving and shedding machine, wherein the weaving machine is driven by means of a main drive, while the shedding machine is driven by means of an electric motor auxiliary drive.
  • weaving and shedding machines are known.
  • the shedding machine comprises a separate drive of which the central drive shaft, from which the motions of the shedding means are derived, is connected with an electric motor.
  • the shedding machines in which the shedding means can be decoupled from the motion of the central drive shaft, which are e.g. dobby machines of the type 2881 from the company Staeubli or Jacquard machines of the type LX from Staeubli or SI from the company Bonas.
  • the drive shaft of the weaving machine from which the further motions (weaving reed, if applicable mechanical weft insertion elements) are derived, is in turn connected with at least one actuator that drives it directly and that is similarly usually embodied as an electric motor.
  • Such direct drives are very simple in their mechanical construction, nearly maintenance free, and very precisely regulateable.
  • the drives of the weaving machine and of the shedding machine are connected by means of a common DC voltage intermediate circuit, hereinafter referred to as a converter intermediate circuit, so that they, mutually together, can form or produce an energy flow.
  • a common DC voltage intermediate circuit hereinafter referred to as a converter intermediate circuit
  • the operating rotational speed in the following
  • a known countermeasure involves reducing this rotational speed. That is to say, the operating rotational speed for the first reed beat-up then lies more or less significantly under the operating rotational speed that is actually provided for the article.
  • this can lead to start marks and an unacceptable reduction of the quality in the woven product.
  • a general reduction of the operating rotational speed is similarly not an acceptable solution, because the production of the product would take correspondingly longer, which puts the economic profitability of the weaving mill in question.
  • the DE 200 21 049 U1 refers to the possibility, for separated drives for weaving and shedding machine, to configure the preferred starting process of the shedding machine that is known from the DE 100 53 079 C1 in such a manner so that it supports the subsequent starting process of the weaving machine with its kinetic energy. For that, the shedding machine is accelerated to a rotational speed above the operating rotational speed that is to be reached at the end of the weaving machine start. While then the weaving machine starts, the shedding machine gives off kinetic energy through re-braking for supporting the starting of the weaving machine, that is to say during its start phase.
  • the DE 200 21 049 U especially due to its focusing on a drive solution with common motorized elements for web and shedding machine—suggests that the braking process of the shedding machine begins with the beginning of the weaving machine start and proceeds (practically) uniformly during this starting process. It has been found, however, that such a feeding back is not optimal, because thereby at the beginning of the weaving machine start the shedding machine would feed back more energy than is required by the weaving machine. The voltage level in lo the common converter intermediate circuit for the drives of weaving and shedding machine would then rise sharply, and the energy would have to be converted into heat in the braking resistance and would be lost for the process.
  • the method for starting or running-up on the one hand comprises the starting or running-up of the shedding machine to a predetermined overspeed or excess rotational speed (named step 1 in the following), and on the other hand comprises the adjusted setting of the rotational speed reduction of the shedding machine in such a manner so that the gradient of the rotational speed curve or progression of the shedding machine is more negative in a later section of the starting phase than in an earlier section (named step 2 in the following).
  • step 1 consists in that the overspeed, to which the shedding machine is accelerated relative to the operating rotational speed at the first reed beat-up, is predetermined, thus exactly defined, in its value and/or its upper limit. It is especially preferred that the overspeed is calculated automatically at least based on machine data, but preferably also based on process data. This will be explained in more detail further below.
  • Step 2 provides a non-ramp-shaped progression or curve, thus a is non-constant gradient—beginning with the overspeed from step 1 —for the rotational speed of the shedding machine, for a time range t 1 to t 3 , that advantageously temporally completely encompasses the starting process from t 2 to t 3 of the weaving machine or also can temporally coincide therewith.
  • the gradient progression or curve is such that the energy feedback is larger in a later time section of the starting process than in an earlier time section. This means that the braking of the shedding machine does not proceed in a uniform manner (ramp-like) over the weaving machine start, but rather becomes stronger in a later section of the starting phase and preferably toward the end of the weaving machine start. In this manner, the actual energy requirement of the weaving machine is taken into account, with consideration of heat and other losses.
  • the feeding back of the energy or power proceeds in a manner adapted to the demand or requirement, that is to say to an especially strong extent when also the demand or requirement by the starting weaving machine is the strongest.
  • the gradient of the rotational speed progression or curve of the shedding machine between the time point t 2 and a time point t′ is less negative than at the temporal center or midpoint between the time points t′ and t 3 .
  • the gradient of the rotational speed curve of the shedding machine toward the end of the starting phase is more negative than in an earlier time period of the starting phase. This means that, at the end of the starting phase more energy is fed back from the shedding machine to the weaving machine than at the beginning of the starting phase.
  • a similar advantageous rotational speed curve provides that at the temporal center or midpoint the gradient of the rotational speed curve of the shedding machine between the time point t 2 and a time point t′ comprises a smaller absolute value than at the temporal center or midpoint between the time points t′ and t 3 .
  • the gradient of the rotational speed curve of the shedding machine toward the end of the starting phase is the most negative out of the entire time period of the starting phase. Therefore, in this embodiment the energy feedback is the greatest at the end of the weaving machine start, at the time point t 3 .
  • the rotational speed curve for the starting weaving machine is prescribed not in a ramp-like manner, but rather has a gradient that decreases over the entire starting process (between the time points t 2 and t 3 ) or at least toward its end.
  • the power take-up is made uniform, that is to say the power peak at the end of the weaving machine start is less strongly pronounced, whereby the energetic starting assistance by the shedding machine is facilitated.
  • the rotational speed of the weaving machine presently is to be understood as the value that is computationally determined from its kinetic energy and the energetically average mass moment of inertia (which will be defined in the following).
  • the stated overspeed or excessive rotational speed of the shedding machine is preferably calculated by means of a computing unit with the use of machine data.
  • the rotational speed curve of the shedding machine for the entire starting phase of the weaving machine is calculated by means of a computing unit with the use of machine data, whereby in this regard the rotational speed curve of the shedding machine is preferably oriented to the computationally expected power demand or requirement of the starting weaving machine.
  • the stated machine data are preferably such data that are partially or all selected from the following group: the mass moment of inertia of the shedding machine and/or of the weaving machine, the energetically average mass moment of inertia of the is shedding machine and/or of the weaving machine, network and supply relevant data such as e.g. characteristic data of the common converter intermediate circuit, technical characteristic data of the drives of the shedding machine and of the weaving machine, the peak power of the supply, etc.
  • process data are preferably utilized for increasing the accuracy in the calculation of the overspeed as well as of the further rotational speed curve of the shedding machine.
  • process data which are advantageously at least partially utilized, are preferably based on calculated or estimated weaving machine losses and advantageously also on shedding machine losses.
  • process data also include such data as are based on the duration of the stated starting phase of the weaving machine.
  • the overspeed of the shedding machine is calculated with regard to the step 1 .
  • at least the energetic average mass moment of inertia of weaving and shedding machine are used as the machine data.
  • the energetic average mass moment of inertia is the mass moment of inertia of an imaginary or virtual flywheel mass, which, rotating at the same operating rotational speed as the working machine (weaving or shedding machine), has the same kinetic energy as the pertinent working machine.
  • a large dimensioning of the shedding drive is not desirable for cost reasons, so that the above proposition to take the energy requirement for the weaving machine start completely out of the shedding machine is not practicable.
  • the calculation example shows, however, that the energetically average mass moments of inertia are sensible values for the determination of the rotational speed profile or the motion path of the shedding machine during the weaving machine start.
  • a further important value is given by the network and supply conditions that were already mentioned above.
  • the characteristic data of the supply for the common converter intermediate circuit of the weaving and shedding machine are taken into account.
  • the peak power of the supply e.g. the two-fold multiple of the rated power
  • the peak power of the supply is advantageously taken into account. It is similarly important whether a pre-transformer is utilized in the weaving mill, e.g. due to specialized networks, e.g. IT-networks. In this regard, the power and the short-circuit voltage or the internal impedance of the pre-amplifier play an important role.
  • the network and supply conditions mentioned in the above scope and context are allocated to the machine data, similarly as the technical characteristic data of the drives of weaving and shedding machine, e.g. peak currents of the regulators or controllers and/or peak rotational moments or torques of the actuators or motors.
  • the expected losses of the weaving machine during the starting process are relevant with regard to the process data. These can be estimated e.g. from the temperatures of the transmission oil, or—if the machine previously was already operating—from its averaged current consumption with consideration of the stopped standstill time or once again the oil temperature and if applicable a new operating rotational speed.
  • the losses of the shedding machine including shedding means (held frames, lifting wires) are preferably also taken into account.
  • the average power and the peak power can be calculated from the total energy requirement or demand of the weaving machine (sum of kinetic energy at operating rotational speed, and compensation of the losses) in the starting process and from the starting duration. In turn, from the network and supply conditions it can be estimated whether and to what extent the starting assistance by the shedding machine is necessary or to be utilized for this power (above all the peak power).
  • the overspeed of the shedding machine at the beginning of the weaving machine start is determined by means of the energetically average mass moment of inertia of the shedding machine, so that upon again breaking to the operating rotational speed the necessary energy or power can be provided. If this would occur under the assumption of a uniform ramp-shaped re-braking of the shedding machine over time, then in this manner one would obtain the lowest possible value that the overspeed of the shedding machine would be allowed to have for the energy feedback.
  • this problem is solved through the use of the step 2 . Due to the gradient of the shedding machine rotational speed that is more negative in a later section of the starting phase during the weaving machine start, at first only little or no energy is fed back into the converter intermediate circuit, and then correspondingly more with increasing time and therewith increasing power or energy demand by the weaving machine.
  • the stated computing unit Before carrying out the abovementioned steps 1 and 2 , it is preferably determined by the stated computing unit on the basis of the machine data and if applicable the process data, whether an energetic starting support by the shedding machine is even necessary. If yes, then the operator advantageously either is requested to activate or to permit this starting support, or is notified that it was automatically activated. In the latter case it is, however, recommendable to give the operator the possibility to again deactivate the starting assistance.
  • FIG. 1 a flow diagram for illustrating a calculation method of the feedback for the case of a constant energy transmission portion
  • FIG. 2 a schematic rotational speed-time diagram with t 1 ⁇ t 2 for clarifying the invention
  • FIG. 3 a schematic rotational speed-time diagram with t 1 ⁇ t 2 similar to FIG. 2 , however with a local maximum of the rotational speed of the shedding machine, and
  • FIG. 4 a schematic rotational speed-time diagram with t 1 >t 2 .
  • FIG. 1 shows a calculation method that proceeds from the starting point to proportionally support the power demand of the weaving machine at every time point of the weaving machine start, wherein the proportion, seen relatively, remains constant (e.g. 40%).
  • the weaving machine start shall proceed in such a manner so that the rotational speed calculated from the kinetic energy and the energetically average mass moment of inertia increases in a ramp-shape over time up to the operating rotational speed.
  • the expected power requirement of the weaving machine is covered in a proportion or fraction that remains constant with respect to percentage, which is possible when the time point t 2 , that is to say the starting time point of the weaving machine, does not lie before the time point t 1 at which the shedding machine has reached its predetermined overspeed.
  • the initial maximum power demand or requirement of the weaving machine is determined from the machine and process data 1 A′.
  • the operating rotational speed and the energetically average mass moment of inertia of the weaving machine are used as machine data.
  • the expected losses or loss moments of the weaving machine and the starting duration, expressed as a time or as a transited angular range, are included as process data.
  • the expected loss moment at the operating rotational speed which is mainly dependent on the oil temperature in the transmissions.
  • the thus-arising summed moment, multiplied by the operating rotational speed provides the maximum required power of the weaving machine.
  • This maximum required power itself is compared to those machine data that characterize the network or supply conditions; this involves the characteristic data of a potential pre-transformer (rated power, short-circuit voltage or internal impedance) as well as the characteristic data of the supply unit for the converter intermediate circuit (passive or active network supply, if applicable a boost or step-up converter function, peak power).
  • the comparison is an estimate. For example, at what peak power the pertinent pre-transformer or the pertinent supply unit will be expected to exhibit what extent of voltage drop is stored in tables.
  • a calculation step 1 B is carried out simultaneously or parallel close in time with the calculation step 1 A, whereby the known peak torque or rotational moment of the shedding drive is multiplied with its operating rotational speed in the calculation step 1 B.
  • the peak power of the shedding drive calculated in this manner is output as a value 1 b ′ (capacity or possibility) from the calculation step 1 B.
  • step 2 first 1 a ′ (demand or requirement) and 1 b ′ (capacity or possibility) are compared. If the demand is greater than the capacity, then problems of the abovementioned type during the starting up to the intended operating rotational speed cannot be excluded. Therefore a reaction is triggered in the step 2 B. This can consist of a warning signal to the operator, if applicable in connection with the request to select a lower operating rotational speed and to start the machine in a testing manner, see path 2 b ′. In this manner, the estimates from step LA can be corrected through an actually observed behavior of the converter intermediate circuit. Another possibility involves automatically reducing the operating rotational speed, under a corresponding information notification to the operator.
  • the pertinent machine start can serve for verification and if applicable correction of the assumptions from step 1 A.
  • the reduced operating rotational speed should be calculated in such a manner so that for it the demand 1 a ′ is exactly as high as the capacity 1 b′.
  • one multiplies half of this peak power with the required time of the weaving machine start one obtains the energy that is to be provided as a supplement on the part of the shedding machine, which it must thus have available at the time point of the weaving machine start t 2 .
  • the operating rotational speed and the energetically average mass moment of inertia of the shedding machine gives the overspeed ⁇ Ü,FBM , which the shedding machine must have—in comparison to the operating rotational speed—at the time point t 2 .
  • pairs of values (support points) are formed with the associated ordinate value of ⁇ FBM (t) or ⁇ FBM (t), from which a software routine (if applicable in the drive regulator or controller itself) generates a mathematical expression corresponding to an electronic cam disk.
  • a software routine if applicable in the drive regulator or controller itself
  • a different advantageous calculation method is the use of polynomials, of which the coefficients are determined in such a manner so that thereby the rotational speed or the angular progression of the shedding machine is predefined for the range of the weaving machine start in the desired manner.
  • FIG. 2 Three exemplary progressions or curves of the rotational speeds of the shedding machine (FBM) and of the weaving machine (WM) as a function of time corresponding to the invention are illustrated in FIG. 2 .
  • the shedding machine is started at the time point to and is driven or run-up, up to the time point t 1 , to the predetermined, especially calculated, overspeed ⁇ Ü,FBM (see above).
  • the weaving machine is started and in a starting phase that extends from the time point t 2 to a time point t 3 , it is run-up to an operating rotational speed ⁇ arb .
  • energy is fed or supplied back from the shedding machine to the weaving machine in a defined manner, whereby a possible calculation method pertaining to this has been presented above.
  • the gradient of the rotational speed curve of the shedding machine is more negative in a later section of the start phase of the weaving machine (that lies between the time points t 2 and t 3 ) than in an earlier section.
  • the later section does not necessarily border on the time point t 3 and/or the earlier section does not necessarily border on the time point t 2 (or t 1 , if t 1 lies later than t 2 , see FIG. 4 ); but rather gradient progressions within the time period between the time points t 2 (or t 1 , if t 1 lies later than t 2 ) and t 3 can be compared with one another.
  • the gradient of the rotational speed curve of the shedding machine which is illustrated with a solid line (here referenced as FBM′), is even the most negative toward the end of the start phase with reference to the entire time span of the start phase, that is to say the curve comprises the greatest negative slope at the time point t 3 within the range between t 2 and t 3 .
  • the gradient of the rotational speed curve of the shedding machine between the time point t 2 and a time point t′ marked as an example in the FIG. 2 is less negative than in the temporal midpoint or center between the time points t′ and t 3 .
  • the rotational speed progression of the weaving machine (here referenced as WM′) which is illustrated with a solid line, is illustrated rising linearly with a ramp-shape in FIG. 2 , as this was assumed in the above calculation method.
  • An alternative rotational speed progression for the weaving machine (here referenced as WM′′) is represented with a dashed line, wherein the rotational speed during the run-up between the time points t 2 and t 3 comprises a decreasing positive gradient. In such a progression, the power take-up is more uniform than in a linear run-up, because the power peak toward the end of the weaving machine start is less pronounced.
  • An exemplary corresponding rotational speed curve of the shedding machine (here referenced as FBM′′) is similarly illustrated with a dashed line.
  • the flatter curve in comparison to the rotational speed curve FBM′, especially toward the end of the start phase of the weaving machine, that is to say at the time point t 3 corresponds to the curve WM′′ of the weaving machine which is flatter there, because the energy feedback toward the end of the start phase of the weaving machine is smaller than for the previously discussed case of the ramp-shaped increase or rise of the rotational speed WM′ of the weaving machine.
  • the rotational speed curve of the weaving machine (here referenced as WM′′′) comprises an S-shape, which is also repeated in the rotational speed curve of the shedding machine, referenced (here as FBM′′′).
  • the energy feedback from the shedding machine to the weaving machine is—after respective flatter rotational speed curves adjoining on the time point t 2 —especially large during the strongest or sharpest rise of the rotational speed of the weaving machine.
  • both rotational speed progressions or curves, FBM′′′ and WM′′′ again flatten off.
  • FIG. 3 The above described case of a local maximum of the rotational speed of the shedding machine is illustrated in FIG. 3 . It must respectively be tested or checked whether this lies above the permissible maximum rotational speed of the shedding machine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US15/546,812 2015-02-12 2016-02-11 Starting Method for a Weaving Machine Abandoned US20180023226A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102015102029.7 2015-02-12
DE102015102029.7A DE102015102029A1 (de) 2015-02-12 2015-02-12 Startverfahren für eine Webmaschine
PCT/EP2016/052923 WO2016128517A1 (de) 2015-02-12 2016-02-11 Startverfahren für eine webmaschine

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US20180023226A1 true US20180023226A1 (en) 2018-01-25

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US15/546,812 Abandoned US20180023226A1 (en) 2015-02-12 2016-02-11 Starting Method for a Weaving Machine

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US (1) US20180023226A1 (enExample)
EP (1) EP3256628B1 (enExample)
JP (1) JP6510059B2 (enExample)
CN (1) CN107208330B (enExample)
DE (1) DE102015102029A1 (enExample)
RU (1) RU2664381C1 (enExample)
WO (1) WO2016128517A1 (enExample)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CZ309248B6 (cs) * 2019-06-13 2022-06-22 VÚTS, a.sю Způsob řízení průběhu zdvihových funkcí hlavních mechanismů tkacího stroje

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017221224B3 (de) 2017-11-27 2019-01-17 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Einrichtung und Verfahren zum Herstellen von Gewebe mit einer Webmaschine und zwei Jacquardmaschinen
JP7365098B2 (ja) * 2018-02-21 2023-10-19 津田駒工業株式会社 織機の駆動制御方法及び駆動制御装置
DE102023209042B3 (de) 2023-09-18 2024-08-29 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Verfahren zum betreiben einer webvorrichtung sowie webvorrichtung

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US4131803A (en) * 1975-11-05 1978-12-26 Toyo Boseki Kabushiki Kaisha Apparatus for detecting defects in sheet material
US4473096A (en) * 1979-08-06 1984-09-25 Leesona Corporation Weft end reception system
US4458726A (en) * 1980-01-23 1984-07-10 Sulzer Brothers, Ltd. Apparatus for controlling weft picking
US4362189A (en) * 1981-01-07 1982-12-07 Leesona Corporation Fluid weft insertion loom monitoring system
US4537226A (en) * 1982-09-24 1985-08-27 Nissan Motor Co., Ltd. System for controlling warp let-off motion of weaving machine during machine downtime
US4513790A (en) * 1983-02-25 1985-04-30 Tsudakoma Corp. Method and apparatus for controlling motor-driven let-off motion for looms
US4781221A (en) * 1985-06-29 1988-11-01 Nissan Motor Co., Ltd. Mispicked weft yarn removing method and system therefor
US4827985A (en) * 1986-12-04 1989-05-09 Tsudakoma Corp. Method of controlling pile warp tension in synchronism with loom movement
US5165454A (en) * 1989-11-20 1992-11-24 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Detection of warp in reed dent before loom start up
US20040031533A1 (en) * 2000-10-26 2004-02-19 Valentin Krumm Method for operating a weaving and shedding machine
US20040025956A1 (en) * 2000-12-12 2004-02-12 Valentin Krumm Drive arrangement for a weaving loom and shedding machine
US6962171B2 (en) * 2000-12-12 2005-11-08 Lindauer Dornier Gesellschaft Mbh Drive arrangement for a weaving loom and shedding machine
US20040261881A1 (en) * 2003-03-25 2004-12-30 Texo Ab (A Swedish Corporation) Device for a weaving machine
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ309248B6 (cs) * 2019-06-13 2022-06-22 VÚTS, a.sю Způsob řízení průběhu zdvihových funkcí hlavních mechanismů tkacího stroje

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EP3256628A1 (de) 2017-12-20
CN107208330A (zh) 2017-09-26
CN107208330B (zh) 2020-03-20
EP3256628B1 (de) 2019-08-07
JP6510059B2 (ja) 2019-05-08
WO2016128517A1 (de) 2016-08-18
JP2018508662A (ja) 2018-03-29
DE102015102029A1 (de) 2016-08-18
RU2664381C1 (ru) 2018-08-16

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